Feeding structure and dual-frequency common-caliber antenna

Embodiments of the invention disclose a feeding structure and a dual-frequency common-caliber antenna, relates to the technical field of communication, and can solve the problem of low utilization rate of the antenna caliber due to difficult realization of multi-frequency common-caliber of an antenna structure in the prior art. According to the method, the dual-frequency common-caliber antenna comprises a first feeding structure corresponding to a first frequency band, wherein the first feeding structure comprises a first dielectric substrate and first metal layers arranged at two opposite sides of the first dielectric substrate; and a second feeding structure corresponding to a second frequency band, wherein the second feeding structure comprises a second dielectric substrate, a conversion structure, and second metal layers arranged at two opposite sides of the second dielectric substrate, a signal output end of the second dielectric substrate is connected with the conversion structure, the conversion struct